Molecularly imprinted materials with core-shell structure for directed desiccation

doi:10.11949/0438-1157.20200210

Abstract

Abstract:

SiO₂ as the support material, methacrylic acid (MAA) as the functional monomer, azodiisobutyronitrile (AIBN) as the initiator, ethylene glycol dimethacrylate (EGDMA) as the cross-linking agent, a surface molecularly imprinted polymer (SMIPs) material which can selectively absorb bitter substances in lemon juice was prepared. Transmission electron microscopy and infrared absorption spectroscopy were used to characterize the SMIPs, followed by adsorption capacity and selectivity studies. The results showed that SMIPs had core-shell structure, good adsorption performance (27.72 mg/g) and fast adsorption capacity (60 min). The adsorption was in accordance with the second-order kinetic model, and the adsorption process was in accordance with the Langmuir monolith adsorption model. Finally, SMIPs were used to remove the bitter substance evodine in lemon juice, and the result showed that SMIPs had good desiccation ability.

Key words: core-shell material, nanomaterials, silica, surface molecular imprinting, sorbents, bitter substances, take off the bitter

摘要：

以SiO₂为支撑材料、甲基丙烯酸（MAA）为功能单体、偶氮二异丁腈（AIBN）为引发剂、乙二醇二甲基丙烯酸酯（EGDMA）为交联剂，制备了可选择性吸附柠檬汁中苦味物质的表面分子印迹聚合物（SMIPs）材料。利用透射电镜和红外吸收光谱等手段对SMIPs进行表征，随后进行吸附能力和选择性研究。结果表明，SMIPs具有核-壳结构，且有着良好的吸附性能（27.72 mg/g）和快速吸附能力（60 min），吸附符合二级动力学模型，吸附过程符合Langmuir单层吸附模型。最后，将SMIPs用于柠檬汁中苦味物质吴茱萸内酯的去除，结果显示SMIPs具有良好的脱苦性能。

关键词: 核-壳材料, 纳米材料, 二氧化硅, 表面分子印迹, 吸附剂, 苦味物质, 脱苦

CLC Number:

R 917

Zhuangfei JIANG, Jiayuan HE, Rongrong MA, Qingyao LI, Lili YANG, Ling TAN, Qihui ZHANG. Molecularly imprinted materials with core-shell structure for directed desiccation[J]. CIESC Journal, 2020, 71(10): 4704-4710.

蒋壮飞, 何家垣, 马蓉蓉, 李清瑶, 杨莉莉, 谭玲, 张起辉. 核-壳结构分子印迹材料用于定向脱苦的研究[J]. 化工学报, 2020, 71(10): 4704-4710.

Figures/Tables 7

Fig.1 Schematic representation of the preparation of surface molecularly imprinted materials and the process of debitterization

Fig.2 Optimization of synthesis conditions

Fig.3 Characterization of surface molecularly imprinted materials

Fig.4 Adsorption capacity of materials

Table 1 Relevant parameters of pseudo-first-order and pseudo-second-order model

Samples

Pseudo-first-order

Pseudo-second-order

Q_e/

(mg/g)

K₁/min^-1

R²

Q_e/

(mg/g)

K₂/

(g/(mg·min))

R²

Table 2 Relevant parameters of Langmuir and Freundlich equation

Samples

Langmuir

Freundlich

Q_m/

(mg/g)

K_L/

(L/mg)

R²

K_F/

(mg/g)

R²

Fig.5 Liquid chromatogram of demitoring process of lemon juice by surface molecularly imprinted materials

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